[OldEngineer]

As a suspension engineer I feel compelled to add some comments.

The anti roll bar is significant to the car dynamics but not in how you feel about a car leaning in corners. If you get less lean that doesn't mean it improves the cornering.

The principal reason for the anti roll bar is to keep the tyres in contact with the road. On a front wheel drive car you want the rear bar to be stiff and the front bar to be loose. In this way the front tyres will work better to get you around the corner as both wheels will contribute to the direction change.

If you stiffen up the front bar the inside wheel will reduce it's help in the direction change. The driver will be very pleased with the lack of roll while the car ploughs straight on and into the ditch.

Strut braces are only there to increase the stiffness of the bodyshell. A brace that just joins the two strut towers does almost nothing to improving stiffness. Bracing the towers to the bulkhead is better. But bodyshells twist and loads need to be transferred diagonally. The roof rails and the pillars are where this load moves (not the roof panel which is only there to keep the rain out)